Bollywood star, Irrfan Khan, has died after being admitted to the intensive care unit at Mumbai's Kokilaben hospital.

After a long battle with cancer, Bollywood actor Rishi Kapoor has died.

'Isibaya' actress Asavela Mngqithi announced that she is pregnant on Instagram.

In the wake of Soleimani's death, a group of 60 American ethicists, including some notable Catholic theologians, released a statement stating that "the drone killing of Iranian General Qassem Soleimani on January 3rd by the United States was not morally justified…"

Many educational institutions fall short of having the bare minimum resources to ensure that learners and teachers are safe during school hours.

It is at times like these that we as a country rely on the relevant stakeholders to take care of our people and put into action the promises made in the preamble of our Constitution, particularly where it is stated that through our freely elected representatives, the quality of life of all citizens is to be improved.

Nowadays many shoppers don’t even remember how they learned about an eCommerce brand in the first place. If you ask them, the most popular answer is “I found it somewhere on the Internet”. Commercial information is all over the place, so nobody cares about the “channel” they use to find it anymore.

Nowadays many shoppers don’t even remember how they learned about an eCommerce brand in the first place. If you ask them, the most popular answer is “I found it somewhere on the Internet”. Commercial information is all over the place, so nobody cares about the “channel” they use to find it anymore.

All it took was a pandemic, but the long-running joke finally became a reality: DEF CON is canceled. 

The annual hacker conference in Las Vegas, Nevada, typically draws tens of thousands of attendees to talk shop, compare notes, and generally cause delightful mischief. One element of that mischief is the constant — and until now false — yearly claim that DEF CON is canceled. The coronavirus changed that, and the organization announced Friday that the in-person conference will not take place this year. 

"The #DEFCONiscanceled meme has crossed over into real life, courtesy of #COVID19," read the announcement. "In early March we had hopes that things would be stable by August. That is no longer realistic." Read more...

Striso is a digital instrument with pressure-sensitive buttons that plays a variety of acoustic-like sounds.  Read more...

TL;DR: You don't have to buy a drum set to learn how to play the drums. Instead, just grab the Senstroke by Redison bluetooth drum kit for $189.95, on sale for 5% off as of May 9.

If you want to learn how to play the drums, then a quality set may cost you upwards of $1,000. Not only is this a hefty price to play for individuals who aren't fully committed to the instrument yet, but their massive size may be impossible to fit inside your space. Or at least your housemates may not appreciate it.

With the Senstroke by Redison Bluetooth Drum Kit and App Bundle, you can practice, play, and record on just about any surface for a much more affordable price — and it'll take up little to no space.  Read more...

An array of scientific evidence suggest that in some cases, the bacteria in your gut–your microbiome–could be tied to neurological and psychological disorders and differences, from anxiety and autism to Parkinson's and schizophrenia. The journal Science published a survey of the field and the Cambridge, Massachusetts start-up Holobiome that hopes to use insight into this "psychobiome" to develop treatments for depression, insomnia, and other conditions with a neurological side to them. From Science:

For example, many people with irritable bowel syndrome are also depressed, people on the autism spectrum tend to have digestive problems, and people with Parkinson’s are prone to constipation.

Researchers have also noticed an increase in depression in people taking antibiotics—but not antiviral or antifungal medications that leave gut bacteria unharmed. Last year, Jeroen Raes, a microbiologist at the Catholic University of Leuven, and colleagues analyzed the health records of two groups—one Belgian, one Dutch—of more then 1000 people participating in surveys of their types of gut bacteria. People with depression had deficits of the same two bacterial species, the authors reported in April 2019 in Nature Microbiology.

Researchers see ways in which gut microbes could influence the brain. Some may secrete messenger molecules that travel though the blood to the brain. Other bacteria may stimulate the vagus nerve, which runs from the base of the brain to the organs in the abdomen. Bacterial molecules might relay signals to the vagus through recently discovered “neuropod” cells that sit in the lining of the gut, sensing its biochemical milieu, including microbial compounds.

The "transient bazaar" known as Lost Horizon Night Market is a covert operation. Worlds are imagined and then built inside the blank canvasses of empty box trucks. For the event, all the "proprietors," and their appointed box trucks, convene in an unsanctioned, though discreet, location. This location is disclosed to would-be "shoppers" via text just a few hours before it starts. Word of the market generally spreads rapidly but not publicly, definitely not by social media. If you're lucky enough to hear about it, you should go.

So, Happy Mutants, this is your heads up. Lost Horizon Night Market: Quarantine Edition is happening Saturday, May 9, from 6:59p EST until 11:59p EST, "rain or shine." This one is a little different, as the spaces are virtual, not in actual, physical trucks. I got a sneak peek yesterday of what's been created and can't wait to dive in deeper. Admission is free, though tips are appreciated. RSVP here.

Previously: Secret box truck 'night market' pops up again in NYC Read the rest

The South African Football Association has confirmed the appointment of advocate Tebogo Motlanthe as new acting CEO.

Instant Reaction: Unemployment, May 8, 2020

Link building, according to a lot of digital marketers, is a very old and very traditional digital marketing method. However, just because it’s all that antiquated doesn’t mean it’s useless. In fact, we may consider link building as one of the most timeless yet most effective digital marketing strategies out there. Link Building: A Quick […]

The post 10 Quick Link Building Tactics For Beginners appeared first on Dumb Little Man.

It can scarcely be denied that the supreme goal of all theory is to make the irreducible basic elements as simple and as few as possible without having to surrender the adequate representation of a single datum of experience.

—Albert Einstein, “On the Method of Theoretical Physics” (1934)

Context: Last week, I pinched off one of my typically woolly emails in response to an acquaintance whom I admire. He’s a swell guy who makes things I love, and he'd written, in part, to express concern that my recent Swift impersonation had been directed explicitly at something he'd made. Which, of course, it hadn’t—but which, as I'll try to discuss here, strikes me as irrelevant.

To paraphrase Bogie, I played it for him, so now I suppose I might as well play it for you.

(n.b.: Excerpted, redacted, munged, and heavily expanded from my original email)

There are at least a couple things that mean a lot to me that I'm still just not very good at.

• Make nuanced points in whatever way they need to be made; even if that ends up seeming “un-nuanced”
• Never explain yourself.

I want to break both these self-imposed rules privately with you here. [Editor’s Note: Um.] Because, I hope to nuance the shit out of some fairly un-nuanced points. And, to do that, I'll also (reluctantly) need to explain myself. But, here goes.

First [regarding my goofing on “distraction-free writing environments”] I think there are some GIANT distinctions at play here that a lot of folks may not find nearly as obvious as I do:

1. Tool Mastery vs. Productivity Pr0n – Finding and learning the right tools for your work vs solely dicking around with the options for those tools is just so important, but also so different. And, admittedly, it’s almost impossible to contrast those differences in terms of hard & fast rules that could be true for all people in all situations. But, that doesn’t make the difference any less qualitatively special or real.
   
   Similarly…

2. Self-Help Vs. “Self”–“Help” – Solving the problem that caused the problem that caused the problem that caused the symptom we eventually noticed. Huge. Arguably, peerless.

   • Viz.: How many of us ignore the actual cause of our problem in favor of just reading dozens of blog posts about how to “turbocharge” its most superficial symptoms? Sick.

3. Focus & Play – Yes, focusing on important work is, as Ford used to say, Job 1. But, that focus benefits when we maintain the durable and unapologetic sense of play that affords true creativity and fosters an emergence of context and connection that’s usually killed by stress. BUT.

   • Again, what conceivable “rule” could ever serve to immutably declare that “THIS goofing-off is critical for hippocampal plasticity” vs. “THAT goofing-off is just dumb, distracting bullshit?”

   • Impossible. Because drawing those kinds of distinctions is one of our most important day-to-day responsibilities. Decisions are hard, and there’s no app or alarm gadget that can change that.

     • Although, they certainly can help mask the depth of the underlying problem that made them seem so—what’s the parlance?—“indispensable”.
     • Think: Elmo Band-Aids for that unsightly pancreatic tumor.

4. Reducing Distraction through Care (Rather than braces, armatures, and puppet strings). Removing interruptions and external distractions that harm your work or life? Great. Counting on your distraction-removal tool to supplement your non-existent motivation to do work that will never get done anyway? Pathetic.

   • Frankly, this is a big reason I'm so galled when anyone touts their tool/product/service as being the poor, misunderstood artist’s new miracle medicine—rather than just admitting they've made a slightly different spoon.
   • Because, let’s be honest: although most of us have plenty of perfectly serviceable spoons, everybody knows collecting cutlery is way more fun than using it to swallow yucky medicine.

5. Using a System Vs. Becoming a System. Having a system or process for getting work done vs. making the iteration of that system or process a replacement for the work. This is just…wow…big.
   
   But, maybe most importantly to me…

6. Embracing the Impossibles. Getting past these or any other intellectual koans by simply accepting life’s innumerable and unresolvable paradoxes, hypocrisies, and impossibilities as God-given gifts of creative constraint. Rather than, say, a mimeographed page of long division problems that must be solved for a whole number, n.

   • I just can’t ever get away from this one. For me, it’s what everything inevitably comes back to.
   • The very definition of our jobs is to solve the right problem at the right level for the right reason—based on a combination of the best info we have for now and a clear-eyed dedication to never pushing an unnecessary rock up an avoidable hill.

   • YET, we keep force-feeding the monster that tells us to fiddle and fart and blame the Big Cruel World whenever we face work that might threaten our fragile personal mythology.

     • “Sigh. I wish I could finally start writing My Novel….Ooooooh, if only I had a slightly nicer pen…and Zeus loved me more….”

All that stuff? That there’s a complex set of ideas to talk about for many complex reasons—not least of which being how many people either despise or (try to) deny the unavoidable impact of ol' number six.

But, here’s the thing: as much as saying so pisses anybody off, I think the topics we're NOT talking about whenever we disappear into Talmudic scholarship about “full-screen mode” or “minimalist desks” or whatever constitutes a “zen habit”—those shunned topics are precisely the things that I believe are most mind-blowingly critical to our real-world happiness as humans.

In fact, I believe that to such a degree that helping provide a voice for those unpopular topics that can be heard over the din is now (what passes for) my career. I really believe these deeper ideas are worth socializing on any number of levels and in many media. Even when it’s inconvenient and slightly disrespectful of someone’s business model.

So, that’s what I try to do. I talk about these things. Seldom by careful design. Often poorly. But, always because they each mean an awful lot to me.

[…]

But, no matter how I end up saying whatever the hell I say, I believe in saying it not simply to be liked or followed or revered as a “nice guy” who pushes out shit-tons of whatever to “help people.”

Because, believe me, friend, a great many of those apparently “nice guys” swarming around the web “helping people” these days are ass-fucking their audience for nickels and calling it a complimentary colonoscopy. And, while I absolutely think that in itself is empirically wrong, I also think it’s just as important to say that it’s wrong. Sometimes, True Things need to be said.

Which in this instance amounts to saying, a) selling people a prettier way to kinda almost but not really write is not, in the canonical sense, “nice”—but, far worse, b) leaving your starry-eyed customers with the nauseatingly misguided impression that their “distraction” originates from anyplace but their own busted-ass brain is really not “helping.” Not on any level. It is, literally, harmful.

“Helping” a junkie become more efficient at keeping his syringe loaded is hardly “nice.”

It’s the opposite of nice. And, it’s the opposite of helpful. These are my True Things.

And, to me, saying your True Things also means not watering down the message you care about in order to render it incapable of even conceivably hurting someone’s feelings—or of even conceivably losing you even one teeny-tiny slice of that precious “market share.”

Well, that’s the price, and I'm fine paying it—best money I've ever spent.

But, it also means trusting your audience by letting each of them decide to add water only as they choose to—by never corrupting the actual concentrate in a way that might make it less useful to the smartest or most eager 5% of people who'd like to try using it undiluted. Because, at that point, you're not only abandoning the coolest people you have the honor of serving—you risk becoming a charlatan.

And, that’s precisely what you become when you start to iteratively inbreed the kind of fucktard audience for whom daily buffets of weak swill and beige assurance are life’s most gratifying reward.

Sure. Those poor bastards may never end up using any of that watery information to do anything more ambitious than turbocharging their most regrettable symptoms. But, who’s the last person in the universe who’s going to grab them by the ears and tell them to get back to work? Exactly—that same “nice guy” whose livelihood now depends on keeping infantalized strangers addicted to his “help.”

Holy shit—no way could I ever live with that. It’s so wrong, it’s not even right. ESC, ESC, ESC!

[…]

Okay. So anyhow, there’s a really long-winded, overly generous, and extremely pompous way of trying to say I don’t know how to do what I do except how I do it. But, I do genuinely feel awful when innocent people feel they have been publicly humiliated or berated simply because I'm some dick who hates people.

Which has to be my favorite irony of all.

When I was a kid, I thought my Mom was “mean” not to let me play in traffic on busy Galbraith Road. Today, I'm not simply grateful that she had the strength and resolve to be so “mean”—I actually can’t imagine how sad it would be to not have people in your life who care enough about your long-term welfare to tell you to stop fucking around in traffic. To where you eventually might start even seeking 12x-daily safety hacks from some of the very same drivers whose recklessness may eventually kill you. Wow.

[…]

Admitting when life is complicated or things aren’t shiny and happy all the time strikes me as a wonderfully sane and adult way to conduct one’s life. That there are so many folks offended by even the existence of this anarchic idea is not a problem I can solve.

No more than I can wish useless email away or pray hard enough that it never rains on anyone’s leaky roof. All out of scope.

And, then, I jizzed on at length about how much I admire the recipient’s work. Which I do.

Good work doesn’t need a cookie

I may admire your work, too. Especially if you care a lot about that work and don’t overly sweat peoples' opinions of it. Most definitely including my own.

For these purposes, it doesn’t really matter whether we're friends and, honestly, it doesn’t even matter whether I love, use, or agree with everything you do, say, or make in a given day.

It doesn’t matter because good work doesn’t need me to love it. Like tornadoes and cold sores, good work happens with total disregard to whether I'm “into it.”

But, conversely, let’s stipulate that the points-of-view undergirding our opinions—again, including mine—will and should survive either agreement or lack of agreement with equivalently effortless ease. Because, like really good work, a really good point-of-view doesn’t require another person’s benediction.

Guess we'll have to disagree to agree

Now, to be only vaguely clearer here, I'm not posting this circuitous ego dump in the service of altering your opinion of either me, my friend, his work, or practically anything else for that matter.

But, I would love it if we could all be more okay with the fact that real life means that we do each have a different, sometimes incongruous, and often totally incompatible point-of-view. Yes. Even you have a point-of-view that someone despises. Ready to change it now? Jesus, I sure hope not.

Then, to be only slightly more clear, I'm also not advocating for that fakey brand of web-based kum ba ya that gets trotted out alternately as “tolerance” or “inclusion” or some styrofoam miniature of “civility.”

I'm absolutely not against all of those things when authentically practiced, but I'm also really skeptical of the well-branded peacemakers who are forever appointing themselves the Internet’s “Now-Now-Let’s-All-Pretend-We're-Just-Saying-the-Same-Useless-Thing-Here” den mothers.

Because we're not all saying the same things. Not at all.

And, it infantalizes some important conversations when we tacitly demand that any instance of honest disagreement be immediately horseshat into a photo opp where some thought leader gets to hoist everyone’s hands in the air like he’s fucking Jimmy Carter.

Nope. Not saying that.

Who will you really rely on?

What I AM saying is that alllllll this seemingly unrelated stuff is absolutely related—that the pattern of not relying on other people for anything you really care about is arguably the great-grandaddy of every useful productivity, creativity, or self-help pattern.

Where’s this matter? Pretty much everywhere you have any sort of stake:

• Don’t rely on other people to remove your totally fake “distractions.”
• Don’t rely on other people to pat your beret, re-tie your cravat, and make you a nice cocoa whenever that mean man on the internet points out that your “distractions” are totally fake. (Which they are)
• Don’t rely on other people to tell you when or whether you have enough information.
• Don’t rely on other people to define your job.
• Don’t rely on other people to “design your lifestyle.”
• Don’t rely on other people to decide when your opinions are acceptable.
• Don’t rely on other people to tell you when you're allowed to be awesome.
• Don’t rely on other people to make you care.
• Don’t even rely on other people to tell you what you should or shouldn’t rely on.

Yes. I went there.

Because that’s the point. These hypocrisies, paradoxes, and ambiguities that people get so wound up about—that many of us are constantly (impotently) trying to resolve—cannot be resolved.

Because, yeah: all of these harrowingly unsolvable problems are immune to new notebooks and less-distracting applications and shinier systems and “nicer” self-“help” and pretty much anything else that is not, specifically, you walking straight into the angriest and least convenient shitstorm you can find and getting your ass kicked until the storm gets bored with kicking it.

Then, you find an even angrier storm. Then, another. And, so on.

“Get the fuck off of my obstacle, Private Pyle!”

Doing that annoying hard stuff is how you grow, get better, and learn what real help looks like. Even if that’s not the answer you wanted to hear. You get better by getting your ass out of your RSS reader and fucking making things until they suck less. Not by buying apps.

You don’t whine about distractions, or derail yourself over needing a nicer pencil sharpener, or aggravate your chronic creative diabetes by starting another desperate waddle to the self-help buffet. No. You work.

And, for what it’s worth, just like you can’t get to the moon by eating cheese, you'll also never leave boot camp with your original scrote intact by telling your drill sergeant to try using more honey than vinegar.

No. That sergeant’s job is to make you miserable. It’s his job to break down your callow conceits about what’s supposed to be easy and fair. It’s his job to emotionally pummel you into giving up and becoming a Marine.

You? You're not there to give the sergeant notes; you're there to sleep two hours a night, then not mind getting beaten for 20 hours until a decent Marine starts to fall out.

Who knows? He may even surprise you by introducing a surprisingly effective “distraction-free learning environment.”

“Tee ell dee ahr, Professor Brainiac.”

Like most humans, I like things I can understand. Like most readers, I love specificity. Like most thinkers, I love clarity. Like most students, I love relevance and practicality. And, like most busy people, believe it or not, I actually do really like it when someone gets straight to the point.

But, here’s the problem. If my 2-year-old daughter asks me about time travel, and I blithely announce, “E=mc²”, I will have said something that is entirely specific, clear, relevant, practical, and/or straight-to-the-point. For somebody.

But, not so much for my daughter. And, to be honest, not even to any useful degree for me.

She'd probably either laugh derisively at me (which she’s great at), or she'd pause and ask, “Whuh dat?” (which she’s even better at).

Thing is, her understanding that jumble of characters less than me—and my understanding it WAY less than Professor Al—has zero impact on the profundity, truth, beauty, or impact of the man’s theory.

Sure. You could quite accurately fault me for being a smartass and a poseur, and you could even berate my toddler for her unaccountably shallow understanding of Modern Physics. But, in any case, you can’t really blame either Albert or his theory.

You're turbocharging nothing

Specifically, Albert can’t begin to tell us what he really knows if we don’t understand math.

So, let’s say this theory you've been hearing about really interests you. And, let’s also pretend, just for the sake of the analogy, that you haven’t completed Calculus III (212) or Quantum Mechanics (403) or even something as elementary as, say, Advanced Astrophysics II (537). I know you have. Obviously. But, let’s pretend. Where do you start?

Well, you could read some tips about learning math. You could find a list of 500 indispensable resources for indispensable math resources. You could buy a new “distraction-free math environment.” Heck, there’s actually nothing to stop you from just declaring yourself a “math expert.” Congratulations, Professor.

Thing is: you still don’t know math.

Which means you still can’t really understand the theory—no more than a pathetic Liberal Arts refugee like me or a dullard Physics ignoramus like my kid can really grok relativity.

Difference is, you will have blown a lot of time hoping that actual expertise follows non-existent effort—while my daughter and I get to remain total novices without charge. Only, we don’t get all mad at the theory as a result; a staggering number of fake math experts do.

I mean, be honest—after all that recreational non-work and make-believe dedication almost trying to kinda learn math sorta—you might actually get frustrated at how brazenly Al defies your fondness for shortcuts by continuing to rely on so many terms and proofs and blah-blah-blah that you still just don’t understand. So annoying.

You may simply decide that Albert Einstein’s a huge dick for never saying things that can be completely understood solely by scanning a headline.

EPIC EINSTEIN FAIL, amirite?

You never really know what you didn’t know until you know it

But, Al just told the truth.

Problem is, Al’s truth not only requires fancy things in order to be truly understood—the more of those fancy things you take away from his truth, the less true it gets. And, by the time it’s been diluted to the point where you're comfortable that you understand it? You'd be understanding the wrong thing. Even I can understand that.

But, not one bit of any of this is Al’s fault. Al doesn’t get to control who uses, abuses, gets, or doesn’t get what he said or why it matters. Especially since he’s been dead for over fifty years.

All I know is, regardless of who has ears to hear it on a given day, it would be to Al’s credit never to mangle something important in order to get it into terms everybody’s ready to handle without actually trying.

And God bless him for never agreeing that your “distractions” to learning math are his problem.

So, yeah, if you only need to hand in a crappy 5-page paper, you could certainly Cliff’s Notes your way through Borges, Eliot, or Joyce in an afternoon, and feel like you haven’t missed a thing. Trouble is, if you did care even a little, it’s impossible to even say how much you're missing since you can’t be bothered to soldier through the source text. The text itself is the entire point.

Even the wonderfully cogent and readable layman’s explanations Einstein himself provided don’t really get to the nut, the application, and the implications of his real theory.

That all takes real math.

That “single datum of experience” matters

Sometimes, complex or difficult things stop being true when you try to make them too simple. Sometimes, you have to actually get laid to understand why people think sex is such a thing. Sometimes, you need to learn some Greek if you really want to understand The Gospel of John. And, yeah, sometimes, you're going to have to just work unbelievably hard at whatever you claim to care about before anyone can begin to help you get any better—or less “distracted”—at it.

The part I really know is what doesn’t work. Reading Penthouse Forum won’t help you CLEP out of Vaginal Intercourse 101. Watching a Rankin-Bass cartoon about the Easter Bunny will teach you very little about the intricacies of transubstantiation. And, if you can’t be troubled to care so much about your work that you reflexively force distractions away, dicking around with yet another writing application will merely aggravate the problem. Ironic, huh?

These quantum mechanics of personal productivity are rife with such frustrating “paradoxes.”

These are True Things.

Achieving expertise and doing creative work is all horribly complicated and difficult and paradoxical and frustrating and recursive and James Joyce-y—and any guide, blog, binary, guru, or “nice guy” that tries to suggest otherwise is probably giving you a complimentary colonoscopy. Do the math.

Want a new syllabus? Sure:

Run straight into your shitstorm, my friends. Reject the impulse to think about work, rather than finishing it. And, open your heart to the remote possibility that any mythology of personal failure that involves messiahs periodically arriving to make everything “easy” for you might not really be helping your work or your mental health or your long-standing addiction to using tools solely to ship new excuses.

Learn your real math, and any slide rule will suffice. Try, make, and do until you quit noticing the tools, and if you still think you need new tools, go try, make, and do more.

If you can pull off this deceptively simple and millennia-old pattern, you'll eventually find that—god by dying god—any partial truth that’s supported your treasured excuses for not working will be replaced by a no-faith-required knowledge that you're really, actually, finally getting better at something you care about.

Which is just sublimely un-distracting.

Dedication

This article is dedicated to my friend, Greg Knauss. No, he’s not the app guy–he’s just a good man who does good work, who accidentally/unintentionally helped me write this rant. He also happens to be a fella who could teach anyone a thing or two about writing with distractions. Thanks, Greg.

The DML News App offers the best in news reporting.

The post JUST IN: Actress and leader of #MeToo movement accuses Bill Maher of sexually harassing her appeared first on Dennis Michael Lynch.

The following article, BREAKING: Sen Marsha Blackburn Introduces Stop COVID Act…Allowing US Citizens To Sue Communist China For Damage They’ve Inflicted On Our Nation, was first published on 100PercentFedUp.com.

Yesterday, Senator Marsha Blackburn (R-TN), along with Senator Martha McSally (R-AZ) introduced the Stop COVID Act, giving Americans the ability to sue Communist China for the damage they’ve inflicted on our nation. Senator Blackburn appeared on Fox News with host Judge Jeanine where she explained the act to Jeanine Pirro. Blackburn told the Fox News […]

Continue reading: BREAKING: Sen Marsha Blackburn Introduces Stop COVID Act…Allowing US Citizens To Sue Communist China For Damage They’ve Inflicted On Our Nation ...

The atypical trichromatic cyanobacterial phytochrome NpTP1 from Nostoc punctiforme ATCC 29133 is a linear tetrapyrrole (bilin)-binding photoreceptor protein that possesses tandem-cysteine residues responsible for shifting its light-sensing maximum to the violet spectral region. Using bioinformatics and phylogenetic analyses, here we established that tandem-cysteine cyanobacterial phytochromes (TCCPs) compose a well-supported monophyletic phytochrome lineage distinct from prototypical red/far-red cyanobacterial phytochromes. To investigate the light-sensing diversity of this family, we compared the spectroscopic properties of NpTP1 (here renamed NpTCCP) with those of three phylogenetically diverged TCCPs identified in the draft genomes of Tolypothrix sp. PCC7910, Scytonema sp. PCC10023, and Gloeocapsa sp. PCC7513. Recombinant photosensory core modules of ToTCCP, ScTCCP, and GlTCCP exhibited violet-blue–absorbing dark-states consistent with dual thioether-linked phycocyanobilin (PCB) chromophores. Photoexcitation generated singly-linked photoproduct mixtures with variable ratios of yellow-orange and red-absorbing species. The photoproduct ratio was strongly influenced by pH and by mutagenesis of TCCP- and phytochrome-specific signature residues. Our experiments support the conclusion that both photoproduct species possess protonated 15E bilin chromophores, but differ in the ionization state of the noncanonical “second” cysteine sulfhydryl group. We found that the ionization state of this and other residues influences subsequent conformational change and downstream signal transmission. We also show that tandem-cysteine phytochromes present in eukaryotes possess similar amino acid substitutions within their chromophore-binding pocket, which tune their spectral properties in an analogous fashion. Taken together, our findings provide a roadmap for tailoring the wavelength specificity of plant phytochromes to optimize plant performance in diverse natural and artificial light environments.

Previous studies have shown that sphingosine kinase interacting protein (SKIP) inhibits sphingosine kinase (SK) function in fibroblasts. SK phosphorylates sphingosine producing the potent signaling molecule sphingosine-1-phosphate (S1P). SKIP gene (SPHKAP) expression is silenced by hypermethylation of its promoter in acute myeloid leukemia (AML). However, why SKIP activity is silenced in primary AML cells is unclear. Here, we investigated the consequences of SKIP down-regulation in AML primary cells and the effects of SKIP re-expression in leukemic cell lines. Using targeted ultra-HPLC-tandem MS (UPLC-MS/MS), we measured sphingolipids (including S1P and ceramides) in AML and control cells. Primary AML cells had significantly lower SK activity and intracellular S1P concentrations than control cells, and SKIP-transfected leukemia cell lines exhibited increased SK activity. These findings show that SKIP re-expression enhances SK activity in leukemia cells. Furthermore, other bioactive sphingolipids such as ceramide were also down-regulated in primary AML cells. Of note, SKIP re-expression in leukemia cells increased ceramide levels 2-fold, inactivated the key signaling protein extracellular signal-regulated kinase, and increased apoptosis following serum deprivation or chemotherapy. These results indicate that SKIP down-regulation in AML reduces SK activity and ceramide levels, an effect that ultimately inhibits apoptosis in leukemia cells. The findings of our study contrast with previous results indicating that SKIP inhibits SK function in fibroblasts and therefore challenge the notion that SKIP always inhibits SK activity.

The peroxisome is a subcellular organelle that functions in essential metabolic pathways, including biosynthesis of plasmalogens, fatty acid β-oxidation of very-long-chain fatty acids, and degradation of hydrogen peroxide. Peroxisome biogenesis disorders (PBDs) manifest as severe dysfunction in multiple organs, including the central nervous system (CNS), but the pathogenic mechanisms in PBDs are largely unknown. Because CNS integrity is coordinately established and maintained by neural cell interactions, we here investigated whether cell-cell communication is impaired and responsible for the neurological defects associated with PBDs. Results from a noncontact co-culture system consisting of primary hippocampal neurons with glial cells revealed that a peroxisome-deficient astrocytic cell line secretes increased levels of brain-derived neurotrophic factor (BDNF), resulting in axonal branching of the neurons. Of note, the BDNF expression in astrocytes was not affected by defects in plasmalogen biosynthesis and peroxisomal fatty acid β-oxidation in the astrocytes. Instead, we found that cytosolic reductive states caused by a mislocalized catalase in the peroxisome-deficient cells induce the elevation in BDNF secretion. Our results suggest that peroxisome deficiency dysregulates neuronal axogenesis by causing a cytosolic reductive state in astrocytes. We conclude that astrocytic peroxisomes regulate BDNF expression and thereby support neuronal integrity and function.

The Mycobacterium tuberculosis virulence factor EsxA and its chaperone EsxB are secreted as a heterodimer (EsxA:B) and are crucial for mycobacterial escape from phagosomes and cytosolic translocation. Current findings support the idea that for EsxA to interact with host membranes, EsxA must dissociate from EsxB at low pH. However, the molecular mechanism by which the EsxA:B heterodimer separates is not clear. In the present study, using liposome-leakage and cytotoxicity assays, LC-MS/MS–based proteomics, and CCF-4 FRET analysis, we obtained evidence that the Nα-acetylation of the Thr-2 residue on EsxA, a post-translational modification that is present in mycobacteria but absent in Escherichia coli, is required for the EsxA:B separation. Substitutions at Thr-2 that precluded Nα-acetylation inhibited the heterodimer separation and hence prevented EsxA from interacting with the host membrane, resulting in attenuated mycobacterial cytosolic translocation and virulence. Molecular dynamics simulations revealed that at low pH, the Nα-acetylated Thr-2 makes direct and frequent “bind-and-release” contacts with EsxB, which generates a force that pulls EsxB away from EsxA. In summary, our findings provide evidence that the Nα-acetylation at Thr-2 of EsxA facilitates dissociation of the EsxA:B heterodimer required for EsxA membrane permeabilization and mycobacterial cytosolic translocation and virulence.

Bacterial type VII secretion systems secrete a wide range of extracellular proteins that play important roles in bacterial viability and in interactions of pathogenic mycobacteria with their hosts. Mycobacterial type VII secretion systems consist of five subtypes, ESX-1–5, and have four substrate classes, namely, Esx, PE, PPE, and Esp proteins. At least some of these substrates are secreted as heterodimers. Each ESX system mediates the secretion of a specific set of Esx, PE, and PPE proteins, raising the question of how these substrates are recognized in a system-specific fashion. For the PE/PPE heterodimers, it has been shown that they interact with their cognate EspG chaperone and that this chaperone determines the designated secretion pathway. However, both structural and pulldown analyses have suggested that EspG cannot interact with the Esx proteins. Therefore, the determining factor for system specificity of the Esx proteins remains unknown. Here, we investigated the secretion specificity of the ESX-1 substrate pair EsxB_1/EsxA_1 in Mycobacterium marinum. Although this substrate pair was hardly secreted when homologously expressed, it was secreted when co-expressed together with the PE35/PPE68_1 pair, indicating that this pair could stimulate secretion of the EsxB_1/EsxA_1 pair. Surprisingly, co-expression of EsxB_1/EsxA_1 with a modified PE35/PPE68_1 version that carried the EspG5 chaperone-binding domain, previously shown to redirect this substrate pair to the ESX-5 system, also resulted in redirection and co-secretion of the Esx pair via ESX-5. Our results suggest a secretion model in which PE35/PPE68_1 determines the system-specific secretion of EsxB_1/EsxA_1.

The plasmas of diabetic or uremic patients and of those receiving peritoneal dialysis treatment have increased levels of the glucose-derived dicarbonyl metabolites like methylglyoxal (MGO), glyoxal (GO), and 3-deoxyglucosone (3-DG). The elevated dicarbonyl levels can contribute to the development of painful neuropathies. Here, we used stimulated immunoreactive Calcitonin Gene–Related Peptide (iCGRP) release as a measure of nociceptor activation, and we found that each dicarbonyl metabolite induces a concentration-, TRPA1-, and Ca2+-dependent iCGRP release. MGO, GO, and 3-DG were about equally potent in the millimolar range. We hypothesized that another dicarbonyl, 3,4-dideoxyglucosone-3-ene (3,4-DGE), which is present in peritoneal dialysis (PD) solutions after heat sterilization, activates nociceptors. We also showed that at body temperatures 3,4-DGE is formed from 3-DG and that concentrations of 3,4-DGE in the micromolar range effectively induced iCGRP release from isolated murine skin. In a novel preparation of the isolated parietal peritoneum PD fluid or 3,4-DGE alone, at concentrations found in PD solutions, stimulated iCGRP release. We also tested whether inflammatory tissue conditions synergize with dicarbonyls to induce iCGRP release from isolated skin. Application of MGO together with bradykinin or prostaglandin E2 resulted in an overadditive effect on iCGRP release, whereas MGO applied at a pH of 5.2 resulted in reduced release, probably due to an MGO-mediated inhibition of transient receptor potential (TRP) V1 receptors. These results indicate that several reactive dicarbonyls activate nociceptors and potentiate inflammatory mediators. Our findings underline the roles of dicarbonyls and TRPA1 receptors in causing pain during diabetes or renal disease.

31 March 2020

Research Event

Event participants

Glada Lahn, Senior Research Fellow, Energy, Environment and Resources Programme, Chatham House
Greg Shapland, Associate Fellow, Middle East and North Africa Programme, Chatham House 
Moderator: Sanam Vakil, Deputy Director and Senior Research Fellow, Middle East and North Africa Programme, Chatham House

7 April 2020

Research Event

Event participants

Fadi El-Jardali, Professor of Health Policy and Systems, American University of Beirut
Moderator: Nadim Houry, Executive Director, Arab Reform Initiative

Extracytoplasmic sugar decoration of glycopolymer components of the bacterial cell wall contributes to their structural diversity. Typically, the molecular mechanism that underpins such a decoration process involves a three-component glycosylation system (TGS) represented by an undecaprenyl-phosphate (Und-P) sugar-activating glycosyltransferase (Und-P GT), a flippase, and a polytopic glycosyltransferase (PolM GT) dedicated to attaching sugar residues to a specific glycopolymer. Here, using bioinformatic analyses, CRISPR-assisted recombineering, structural analysis of cell wall–associated polysaccharides (CWPS) through MALDI-TOF MS and methylation analysis, we report on three such systems in the bacterium Lactococcus lactis. On the basis of sequence similarities, we first identified three gene pairs, csdAB, csdCD, and csdEF, each encoding an Und-P GT and a PolM GT, as potential TGS component candidates. Our experimental results show that csdAB and csdCD are involved in Glc side-chain addition on the CWPS components rhamnan and polysaccharide pellicle (PSP), respectively, whereas csdEF plays a role in galactosylation of lipoteichoic acid (LTA). We also identified a potential flippase encoded in the L. lactis genome (llnz_02975, cflA) and confirmed that it participates in the glycosylation of the three cell wall glycopolymers rhamnan, PSP, and LTA, thus indicating that its function is shared by the three TGSs. Finally, we observed that glucosylation of both rhamnan and PSP can increase resistance to bacteriophage predation and that LTA galactosylation alters L. lactis resistance to bacteriocin.

Neoantimycins are anticancer compounds of 15-membered ring antimycin-type depsipeptides. They are biosynthesized by a hybrid multimodular protein complex of nonribosomal peptide synthetase (NRPS) and polyketide synthase (PKS), typically from the starting precursor 3-formamidosalicylate. Examining fermentation extracts of Streptomyces conglobatus, here we discovered four new neoantimycin analogs, unantimycins B–E, in which 3-formamidosalicylates are replaced by an unusual 3-hydroxybenzoate (3-HBA) moiety. Unantimycins B–E exhibited levels of anticancer activities similar to those of the chemotherapeutic drug cisplatin in human lung cancer, colorectal cancer, and melanoma cells. Notably, they mostly displayed no significant toxicity toward noncancerous cells, unlike the serious toxicities generally reported for antimycin-type natural products. Using site-directed mutagenesis and heterologous expression, we found that unantimycin productions are correlated with the activity of a chorismatase homolog, the nat-hyg5 gene, from a type I PKS gene cluster. Biochemical analysis confirmed that the catalytic activity of Nat-hyg5 generates 3-HBA from chorismate. Finally, we achieved selective production of unantimycins B and C by engineering a chassis host. On the basis of these findings, we propose that unantimycin biosynthesis is directed by the neoantimycin-producing NRPS–PKS complex and initiated with the starter unit of 3-HBA. The elucidation of the biosynthetic unantimycin pathway reported here paves the way to improve the yield of these compounds for evaluation in oncotherapeutic applications.

For successful infection of their hosts, pathogenic bacteria recognize host-derived signals that induce the expression of virulence factors in a spatiotemporal manner. The fulminating food-borne pathogen Vibrio vulnificus produces a cytolysin/hemolysin protein encoded by the vvhBA operon, which is a virulence factor preferentially expressed upon exposure to murine blood and macrophages. The Fe-S cluster containing transcriptional regulator IscR activates the vvhBA operon in response to nitrosative stress and iron starvation, during which the cellular IscR protein level increases. Here, electrophoretic mobility shift and DNase I protection assays revealed that IscR directly binds downstream of the vvhBA promoter PvvhBA, which is unusual for a positive regulator. We found that in addition to IscR, the transcriptional regulator HlyU activates vvhBA transcription by directly binding upstream of PvvhBA, whereas the histone-like nucleoid-structuring protein (H-NS) represses vvhBA by extensively binding to both downstream and upstream regions of its promoter. Of note, the binding sites of IscR and HlyU overlapped with those of H-NS. We further substantiated that IscR and HlyU outcompete H-NS for binding to the PvvhBA regulatory region, resulting in the release of H-NS repression and vvhBA induction. We conclude that concurrent antirepression by IscR and HlyU at regions both downstream and upstream of PvvhBA provides V. vulnificus with the means of integrating host-derived signal(s) such as nitrosative stress and iron starvation for precise regulation of vvhBA transcription, thereby enabling successful host infection.

Sulfur is essential for biological processes such as amino acid biogenesis, iron–sulfur cluster formation, and redox homeostasis. To acquire sulfur-containing compounds from the environment, bacteria have evolved high-affinity uptake systems, predominant among which is the ABC transporter family. Theses membrane-embedded enzymes use the energy of ATP hydrolysis for transmembrane transport of a wide range of biomolecules against concentration gradients. Three distinct bacterial ABC import systems of sulfur-containing compounds have been identified, but the molecular details of their transport mechanism remain poorly characterized. Here we provide results from a biochemical analysis of the purified Escherichia coli YecSC-FliY cysteine/cystine import system. We found that the substrate-binding protein FliY binds l-cystine, l-cysteine, and d-cysteine with micromolar affinities. However, binding of the l- and d-enantiomers induced different conformational changes of FliY, where the l- enantiomer–substrate-binding protein complex interacted more efficiently with the YecSC transporter. YecSC had low basal ATPase activity that was moderately stimulated by apo FliY, more strongly by d-cysteine–bound FliY, and maximally by l-cysteine– or l-cystine–bound FliY. However, at high FliY concentrations, YecSC reached maximal ATPase rates independent of the presence or nature of the substrate. These results suggest that FliY exists in a conformational equilibrium between an open, unliganded form that does not bind to the YecSC transporter and closed, unliganded and closed, liganded forms that bind this transporter with variable affinities but equally stimulate its ATPase activity. These findings differ from previous observations for similar ABC transporters, highlighting the extent of mechanistic diversity in this large protein family.

NAD+ is a central metabolite participating in core metabolic redox reactions. The prokaryotic NAD synthetase enzyme NadE catalyzes the last step of NAD+ biosynthesis, converting nicotinic acid adenine dinucleotide (NaAD) to NAD+. Some members of the NadE family use l-glutamine as a nitrogen donor and are named NadEGln. Previous gene neighborhood analysis has indicated that the bacterial nadE gene is frequently clustered with the gene encoding the regulatory signal transduction protein PII, suggesting a functional relationship between these proteins in response to the nutritional status and the carbon/nitrogen ratio of the bacterial cell. Here, using affinity chromatography, bioinformatics analyses, NAD synthetase activity, and biolayer interferometry assays, we show that PII and NadEGln physically interact in vitro, that this complex relieves NadEGln negative feedback inhibition by NAD+. This mechanism is conserved in distantly related bacteria. Of note, the PII protein allosteric effector and cellular nitrogen level indicator 2-oxoglutarate (2-OG) inhibited the formation of the PII-NadEGln complex within a physiological range. These results indicate an interplay between the levels of ATP, ADP, 2-OG, PII-sensed glutamine, and NAD+, representing a metabolic hub that may balance the levels of core nitrogen and carbon metabolites. Our findings support the notion that PII proteins act as a dissociable regulatory subunit of NadEGln, thereby enabling the control of NAD+ biosynthesis according to the nutritional status of the bacterial cell.

The formation of translationally inactive 70S dimers (called 100S ribosomes) by hibernation-promoting factor is a widespread survival strategy among bacteria. Ribosome dimerization is thought to be reversible, with the dissociation of the 100S complexes enabling ribosome recycling for participation in new rounds of translation. The precise pathway of 100S ribosome recycling has been unclear. We previously found that the heat-shock GTPase HflX in the human pathogen Staphylococcus aureus is a minor disassembly factor. Cells lacking hflX do not accumulate 100S ribosomes unless they are subjected to heat exposure, suggesting the existence of an alternative pathway during nonstressed conditions. Here, we provide biochemical and genetic evidence that two essential translation factors, ribosome-recycling factor (RRF) and GTPase elongation factor G (EF-G), synergistically split 100S ribosomes in a GTP-dependent but tRNA translocation-independent manner. We found that although HflX and the RRF/EF-G pair are functionally interchangeable, HflX is expressed at low levels and is dispensable under normal growth conditions. The bacterial RRF/EF-G pair was previously known to target only the post-termination 70S complexes; our results reveal a new role in the reversal of ribosome hibernation that is intimately linked to bacterial pathogenesis, persister formation, stress responses, and ribosome integrity.

Bacterial type VII secretion systems secrete a wide range of extracellular proteins that play important roles in bacterial viability and in interactions of pathogenic mycobacteria with their hosts. Mycobacterial type VII secretion systems consist of five subtypes, ESX-1–5, and have four substrate classes, namely, Esx, PE, PPE, and Esp proteins. At least some of these substrates are secreted as heterodimers. Each ESX system mediates the secretion of a specific set of Esx, PE, and PPE proteins, raising the question of how these substrates are recognized in a system-specific fashion. For the PE/PPE heterodimers, it has been shown that they interact with their cognate EspG chaperone and that this chaperone determines the designated secretion pathway. However, both structural and pulldown analyses have suggested that EspG cannot interact with the Esx proteins. Therefore, the determining factor for system specificity of the Esx proteins remains unknown. Here, we investigated the secretion specificity of the ESX-1 substrate pair EsxB_1/EsxA_1 in Mycobacterium marinum. Although this substrate pair was hardly secreted when homologously expressed, it was secreted when co-expressed together with the PE35/PPE68_1 pair, indicating that this pair could stimulate secretion of the EsxB_1/EsxA_1 pair. Surprisingly, co-expression of EsxB_1/EsxA_1 with a modified PE35/PPE68_1 version that carried the EspG5 chaperone-binding domain, previously shown to redirect this substrate pair to the ESX-5 system, also resulted in redirection and co-secretion of the Esx pair via ESX-5. Our results suggest a secretion model in which PE35/PPE68_1 determines the system-specific secretion of EsxB_1/EsxA_1.

Open Letter by the conveners of the Vision Europe Summit regarding the refugee crisis in Europe and the necessity to act now.

Invitation Only Research Event

Invitation Only Research Event

Event participants

Xenia Wickett, Project Director, US; Dean, The Queen Elizabeth II Academy for Leadership in International Affairs, Chatham House
Dr Christian Moelling, International Security Division Associate, SWP-Berlin

Invitation Only Research Event

Event participants

Megan Greene, Managing Director and Chief Economist, Manulife Asset Management 

29 November 2019

15 April 2020

For successful infection of their hosts, pathogenic bacteria recognize host-derived signals that induce the expression of virulence factors in a spatiotemporal manner. The fulminating food-borne pathogen Vibrio vulnificus produces a cytolysin/hemolysin protein encoded by the vvhBA operon, which is a virulence factor preferentially expressed upon exposure to murine blood and macrophages. The Fe-S cluster containing transcriptional regulator IscR activates the vvhBA operon in response to nitrosative stress and iron starvation, during which the cellular IscR protein level increases. Here, electrophoretic mobility shift and DNase I protection assays revealed that IscR directly binds downstream of the vvhBA promoter PvvhBA, which is unusual for a positive regulator. We found that in addition to IscR, the transcriptional regulator HlyU activates vvhBA transcription by directly binding upstream of PvvhBA, whereas the histone-like nucleoid-structuring protein (H-NS) represses vvhBA by extensively binding to both downstream and upstream regions of its promoter. Of note, the binding sites of IscR and HlyU overlapped with those of H-NS. We further substantiated that IscR and HlyU outcompete H-NS for binding to the PvvhBA regulatory region, resulting in the release of H-NS repression and vvhBA induction. We conclude that concurrent antirepression by IscR and HlyU at regions both downstream and upstream of PvvhBA provides V. vulnificus with the means of integrating host-derived signal(s) such as nitrosative stress and iron starvation for precise regulation of vvhBA transcription, thereby enabling successful host infection.

Bacterial products such as lipopolysaccharides (or endotoxin) cause systemic inflammation, resulting in a substantial global health burden. The onset, progression, and resolution of the inflammatory response to endotoxin are usually tightly controlled to avoid chronic inflammation. Members of the NF-κB family of transcription factors are key drivers of inflammation that activate sets of genes in response to inflammatory signals. Such responses are typically short-lived and can be suppressed by proteins that act post-translationally, such as the SOCS (suppressor of cytokine signaling) family. Less is known about direct transcriptional regulation of these responses, however. Here, using a combination of in vitro approaches and in vivo animal models, we show that endotoxin treatment induced expression of the well-characterized transcriptional repressor Krüppel-like factor 3 (KLF3), which, in turn, directly repressed the expression of the NF-κB family member RELA/p65. We also observed that KLF3-deficient mice were hypersensitive to endotoxin and exhibited elevated levels of circulating Ly6C+ monocytes and macrophage-derived inflammatory cytokines. These findings reveal that KLF3 is a fundamental suppressor that operates as a feedback inhibitor of RELA/p65 and may be important in facilitating the resolution of inflammation.

Heat shock factor 1 (HSF1) regulates cellular adaptation to challenges such as heat shock and oxidative and proteotoxic stresses. We have recently reported a previously unappreciated role for HSF1 in the regulation of energy metabolism in fat tissues; however, whether HSF1 is differentially expressed in adipose depots and how its levels are regulated in fat tissues remain unclear. Here, we show that HSF1 levels are higher in brown and subcutaneous fat tissues than in those in the visceral depot and that HSF1 is more abundant in differentiated, thermogenic adipocytes. Gene expression experiments indicated that HSF1 is transcriptionally regulated in fat by agents that modulate cAMP levels, by cold exposure, and by pharmacological stimulation of β-adrenergic signaling. An in silico promoter analysis helped identify a putative response element for activating transcription factor 3 (ATF3) at −258 to −250 base pairs from the HSF1 transcriptional start site, and electrophoretic mobility shift and ChIP assays confirmed ATF3 binding to this sequence. Furthermore, functional assays disclosed that ATF3 is necessary and sufficient for HSF1 regulation. Detailed gene expression analysis revealed that ATF3 is one of the most highly induced ATFs in thermogenic tissues of mice exposed to cold temperatures or treated with the β-adrenergic receptor agonist CL316,243 and that its expression is induced by modulators of cAMP levels in isolated adipocytes. To the best of our knowledge, our results show for the first time that HSF1 is transcriptionally controlled by ATF3 in response to classic stimuli that promote heat generation in thermogenic tissues.

Marilyn Goudreault
Jan 1, 2009; 8:157-171
Research

Amelia C. Peterson
Nov 1, 2012; 11:1475-1488
Technological Innovation and Resources

Boris Macek
Feb 1, 2008; 7:299-307
Research

Jonathan C. Trinidad
Aug 1, 2012; 11:215-229
Research

Yi Zhang
Sep 1, 2005; 4:1240-1250
Research